Araneae are wingless air breathing arthropods with four pairs of legs and fangs which often have a capacity to inject venom, they also have spinnerets. The order includes some 50,000 described species and is ranked 7th in the largest groups of animalia. Spiders have two distinct body segments, the prosoma which incorporates the head and a thorax like segment to support the legs and an abdomen like segment which incorporates the organs.   


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